Roller type gray scale scanner



FIG. 1 is a front elevational view of a roller type gray scale scanner;

FIG. 2 is a rear elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is a top view;

FIG. 6 is a bottom view; and,

FIG. 7 is a perspective view. 

The ornamental design for a roller type gray scale scanner, as shown. 